Miraculous phenomena as an integral feature of Arthurian literature have always been a central focus of research, notably in approaches centering on the history of motifs and sources, and those with a structural bent. But with the new concern for issues posed by the history of mentality, problems of acculturation and functionalization have moved to centre stage. Francis Dubost's theories on the fantastic play a cardinal role in this development. These proceedings of an interdisciplinary research colloquium of the German section of the International Arthurian Society discuss the state of research at present and emphasize the broad historical basis for miraculous elements in literature from the High Middle Ages to the modern age.